Antiskid device.



D. J. MARTIN.

ANTISKID DEVICE. APPLIUA'PIOH FILED JAI.20. 1911 1,023,580. Patented Apr. 16, 1912.

WITNESSES INVENTOR ATTORNEYS 'U'NiCrEIj STATES 13413517113NTaOFFICE..v

DOUGLAS .1. MARTIN, on NEW YORK, N. Y.

To ally-ham, it may concern; Be it known that I, Dowonas J. Manrxx, a citizen of the United States, and a resident of the city of New York, borough of Manhattan. in the county'and State of New iorl have invented a new and Improved Antislnd Device, of which the following is a fulhclear. and exact description. J My inventionrelatesto an anti-skid chain adapted to he placed upon vehicle tires, and

*siecially adapted for use in connection with pneumatic tires on automobiles and similar vehicles.

It has been found in the use of the. form of skid chains now on the market. that two or three links on the working trend of the tire wear down very rapidlv, ..\vhile ,the chains on the side or oilset from the working tread remain in as good a condition as when first applied. In order to repair the chain. it is customary either to take out the few worn inks or else to reinsert an ontirclyrnenchein or a new section of chain, necessit tin? great expense and inconvenience so that it will be seen that it is not possible to use thee'ntire chain in order to get the full working value of its construction.

An object of my invention is to overcome this difficulty by constructing a chain which as soon as it is somewhat worn on the tread.

niay befed to one side. thereby presenting aZjncw unworn portion of the chain to the ivearing action between the tire and road surface.

Another objectof my invention is to provide a-chain' so constructed and adapted as -to be readily placed upon the tire of a wheel.

A further object of my invention is to provide a chain so constructed and arranged that difl'crent parts of the chain may be progres'sively fed across the wearing surface,

lVith the above and other objects in view, as will more fully hereinafter appear, the present invention consists. in certain novel 'details' of construction and arrangement of,

parts hereinafter fully descrfloed, illustrated in the accompanying drawings, and more particularly pointed out ing the appended claims.

Reference is to he had to the accompanya I Specification of Letters Patent. Application an January 20, 1911. Serial in. 603,634.

' preferred construction,

.the opposite c almaringi for the tivo-pa'rt spring jaw ing drawings forming a part of this spec-ification, in which similar characters of reference indicate corresponding parts in all the figures, and in which Patented Apr. 16,1912;

Figure 1 is aside elevation of part of a I wheel construction; showing a preferred embodiment of my invention applied thereto; Fig. 2 is aperspectivg view of thefastening clamp; and Fig.3 is a plan view looking down upon a scctionof the wheel shown in Fig.1 I i In the several figures, I have shown a common form of wheel having a. rim A, spokes B and a tire C. My anti-skid device is placed about this tire C, and comprises a series of ndlcss chains 1, preferably made up of flat inks, or of links of a half-turned variety. These chains are laid on the tire, and are preferably"rectangular iii-plan hutconform to the configuration of the tire. The chains are spaced apart a' predetermined. distance, and the adjacent corners 2 and 3 of successive chains are fastened together on the side by means of a clamp =4. Instead of laying the chain flatas shown, the chain may bejturncd on itself about ninety degrees. to form. alined eyes in adjacent links. through which ali'ned eyes inav be passed teeth 16. hereinafter described; so

'as to make a 'right-anglepull hetwccnthe chains extending in a direction across and along the tire. The c ampsl may be of-any but in this-disclosure I have shown ar-holloiv rectangular casing 5. havingoppositc relatively broad flat faces 6, adapted to lic'fiat against the side of the tire (1.. and having on the opposite edges. 7, ali'ned apertures 8. adjacent each, end. Further. there is centrally lisposed. in each of da es. a slot 9.

Adapted -to be inserted in the OPPOSI'ZG open ends IQ of the casing, is a substantially U-shaped spring men lger 11, the legs of which are outturned to form lugs 12 adapted to fit in each pair of the alined apertures 8. or in the slot 9- whenzitisdesired to draw the chains closer together. The crotch 13of the spring member-11 afi'ords centrally pii'oted u'pdn this hearing. This crotch or hearing 13 is ofisct a suflicient distance from the edgeof the casing 6J1 order site r set are j open.

to allow thejaws to be rotated about their fulcrum point 15. The jaws 14 comprise two pivoted parts, each part being formed of'a plate with the part.in advance'of the fulcrum point at a large acute single to the art in rear of the fulcrum point, and.

inged together, thereby forming an opposeddouble jaw device. Theends of'each of these points are bent inward to form the teeth 16. It will be seen by this arrangement, that while the teeth 16 on one side of the fulcrum point are in-contact, the teeth on the other side of the point are open; that is, while the jaws qn one side are in engagement with the chain, the jaws of the oppo- Pins 18 may be passed thriiugh the jaws 14 to further take up slack in the chain.

The chain may be assembled on the tire, as shown in Fig. 1 and used in this position until the few links at the apex 17 of the bearing surface of the tire begin to show wear; then, as the chain does not fit absolutely tight about the tire but admits of some play, the jaw 14 may be rotated about the fulcrum point 13, thereby drawing the chain a slight distance across the tire. By this movement, the opposite open jaw will be brought up into engagement with the chain .a distance beyond the gripping portion, dependent upon the distance between the opposed jaws, and the chain will be gripped in a new position, and, at the same time, will be released from its old position. Then by going entirely around the periphcry of the wheel, each jaw may be rotated and the worn links in each chain drawn to construction and many apparently widely the side ofthe tire ontof the line of the wearing portion of the wheel, and a new unworn portion of the chain fed on to this position. tion and arrangement. that the entire chain may be worn uniformly, thereby prolonging the life of the chain.

any changes could he made in the above diflerent embodiments of this invention could be made without departing from the scope thereof. It is intended that all matters contained herein, in the above description, or shown in the accompanying draw ings. shall be interpreted as illustrative and not in a limiting sense. It is also to be 1111- dcrstood that the language used in the following claims is merely intended tocover all the generic and specific features of the invention herein described and all state- It will be seen by this construcment's'iof the scope of the invention, which as a n'iatter of language, might be said to fall tfilj rebetwccmand that materials, sizes I and5- r1ativitics of parts are non-essentiahl exceptgjas called for in the claims.

Having thus described.- my invention, 1'

claim as new and desire to secure by Let ters Patentz 1. him anti skiddevice, a series of endless chains adapted to be spaced apart about a tire, clamps connecting adjacent chains at -the side'of said tire, to keep the chains in open position, each clamp havinga pair of cips pivoted to the opposite ends thereof,

feach clip having double jaws and teeth prujecting inwardly from opposite jaws, the teeth of one jaw engaging the adjacent chain, said clips pivoted to the clamps whereby the jaws may be rotated to carry the attached chain to a new position, so that it may be grasped in the new position by the opposite jaw of the clip. 2. In an ant'rskld device, a series of endless chains rectangular in plan. spaced apart on a tireand conforming to the configuration of the top and side oft he san ta aclamp fastening together adjacent corners of'successive chains, said clamp comprising a reetangular casing having flat faces adapted to lie fiat against the side of thet ire and having alined apertures adjacent each end. U-shaped spring members engaging in said apertures. and av two-part spring jaw pivoted on the crotch of each member, one of said jaw portions engaging the adjacent chain. a

3. In an anti-skid device, aseries of end less chains adapted to be spaced about a tire, clamps betweenadjacent chains at the sides of the tire to keepthe chains in open position, a clip on each end of the clamps,

each clip having double spring jaws on each end of the same, and teeth projectl\ng inwardly from the opposite jaws, the teeth of one jaw engaging the'chains, so that the clip may be rotated to carry each chain to a new position in order that it may be grasped in a new position by the teeth of the other jaw.

4. An anti-skid device, comprising a series of endless chains spaced apart and forming gripping tread members a posed across thetread porti n of.the tire.

clamps positioned between adjacent members, each of said clamps having a double jaw clip pivoted at its center to opposite ends of the clamps, one jawof each clip engaging the adjacent tread member, whereby 'the,rotation of said clip will feed portions ot' said of the tire,

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0.

ted to be distread members across the wearing portions 

